Use CircleCI 2.0 for builds (#3731)

.circleci/config.yml

@@ -0,0 +1,47 @@
+---
+defaults: &defaults
+  docker:
+    - image: 'circleci/golang:1.9.2'
+  working_directory: '/go/src/github.com/influxdata/telegraf'
+version: 2
+jobs:
+  build:
+    <<: *defaults
+    steps:
+      - checkout
+      - run: 'make ci-test'
+  release:
+    <<: *defaults
+    steps:
+      - checkout
+      - run: './scripts/release.sh'
+      - store_artifacts:
+          path: './artifacts'
+          destination: '.'
+  nightly:
+    <<: *defaults
+    steps:
+      - checkout
+      - run: './scripts/release.sh'
+      - store_artifacts:
+          path: './artifacts'
+          destination: '.'
+workflows:
+  version: 2
+  build_and_release:
+    jobs:
+      - 'build'
+      - 'release':
+          requires:
+            - 'build'
+  nightly:
+    jobs:
+      - 'build'
+      - 'nightly'
+    triggers:
+      - schedule:
+          cron: "0 0 * * *"
+          filters:
+            branches:
+              only:
+                - master